quality concentration的用法和樣例：
例句
- The difference between par-ticle mass concentration and Bosch smoke number is indicated.
指出微粒的質(zhì)量濃度與波許煙度的不同。 - The alkalescent condition reduces the mass concentration of iron ions and fastens the nitration reaction of ammonia nitrogen, and leads to the concentration of nitrate.
偏堿性條件使鐵離子質(zhì)量濃度降低，同時(shí)促進(jìn)了氨氮硝化反應進(jìn)行，使礦井水中硝酸鹽和亞硝酸鹽質(zhì)量濃度增加。
